There has been a lot of entertainment news lately about former That ’70s Show star Mila Kunis and her former co-star, now finance, Ashton Kutcher. But how can we resist? They are just so adorable.

In January, Kunis and Kutcher were seen puckering up for the Kiss Cam at the L.A. Lakers game. Then, last week, they were spotted on a double date with Two and a Half Men star Jon Cryer and his wife, Lisa Joyner. Most recently, the couple were seen cutting a rug at Mila’s uncle’s birthday bash at the Premier Russian restaurant in Studio City, California.

On Saturday night, 36-year old Kutcher smiled as he hit the dance floor in a blue dress shirt and jeans while Kunis wore a short, free-flowing white dress (leaving the pregnancy rumor open, it seems) and sported her sizable engagement ring.

“It’s a simple band with a round diamond,” said a friend of the couple. “No baguettes, no insets. It’s not ostentatious, like a Kim Kardashian ring. She doesn’t need a security team with her to wear it. It’s a lot like her and Ashton.”

According to E! Online, the two had no trouble engaging in some serious PDA before leaving the birthday celebration around 1 a.m.

Last night at the season two cast preview of the original Netflix series, Orange is the New Black, E! News got a chance to speak with Laura Prepon, former co-star of both Kunis and Kutcher.

“Yeah, I don’t usually comment on my friends’ personal lives,” the 34-year old said, “But they’re an amazing couple.”

Prepon isn’t the only former co-star of the two who has commented on their relationship. In November, Kurtwood Smith, who played Red Forman on That ’70s Show, told E! News, “They’re both great people, so I’m happy for them.

“Maybe they should get married,” he added with a laugh. “We’ll all go to the wedding and that could be the reunion. It’ll be a reality show.”

Nice foreshadowing, Red. Or perhaps it was a spoiler. Either way, friends of the couple seem pleased that they have ended up together.

Recently, it was reported that Kunis will be appearing alongside Kutcher – and friend Jon Cryer – on Two and a Half Men, though no air date has been announced yet.

Image via YouTube